How to build my IC (4-bit counter SN7475)?

First of all, sorry if this question has already been asked, I am a new user of the application and new to digital electronics altogether.

I am supposed to make a 4-bit counter using SN7475, to count up/down when pushing a button.

And I do not know where to start. How to make the D latches for the connections? Any tips would be great. Thanks guys.

You need to create a fritzing part for the 7475 because there doesn’t seem to be one available (there was one at some point but the github page no longer exists.) Changing the labels in a generic IC is probably the easiest course for that. I expect that process is covered in the tutorials here:


I know that I have to create a part, and setting the pins and changing the label names was the only thing that I managed to do.

Implementing the logic behind is hard. In order for my board to work, I have to make 4 D-latches and connect them like in this picture, and the Q’s are the bits of the counter.

My problem is how to make the D-latches, and I can’t get over this step.

I think perhaps your expectations of Fritzing are too high :-). It only produces the schematic and pcb, it doesn’t do simulation so it doesn’t need (unless you want it for the schematic) the internals of the part. It doesn’t care what the part does, only what connections it has to other parts. So as long as you have the pin names on the box you can connect power supplies, resistors and switches to the pins to make your circuit. The idea is that you then build it physically on a real breadboard and do the testing there.


Hi Peter!

Thanks a lot for your insight. I have solved the problem now

@DanielW have you figured it out? I am looking for the same thing :joy:

Welcome aboard, he doesn’t appear to have posted his part. A google search for “frtizing part 7475” doesn’t turn up anything except an expired link (which should probably be the github link below, as it looks to be the same person.) However a search for “frtizing part 74ls75” finds a github repo here:

which contains a 74ls75.fzpz file. If you download that and load it in to Fritzing via File->Open it should put the part in your mine parts bin ready for use. If that had not been available you could drag the generic IC from core parts in to your sketch, then in Inspector (the bottom right window) change the number of pins to 16 from the default 8, and added pin labels via the edit labels tab in Inspector to make yourself a 7475 part (that looks to be the source of the part in the github repo). If you have problems feel free to post again.


@vanepp thank you for the help. I’ll check it out.